Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbac6fa844556839…

MALICIOUS

PDF

84.1 KB Created: 2021-07-20 19:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ef8c58face4d9e81c7a663f4b3374bb SHA-1: b832bbc8d931a39a92741f44221b462c8589c23d SHA-256: fbac6fa844556839101b2d9f4bca2ce0f17f2b115433c4dc2a0655f04bbb292b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links, many of which point to compromised WordPress sites and disposable hosting domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdcd00dd960---notuval.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab15c699665---54917076410.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b891794cea---8652766390.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/d8b07bb648c031dfe6eadac56a9c46bf/11670122772.pdf
    • http://elencostruzioni.it/userfiles/files/pisazik.pdf
    • http://transinfosoft.com/userfiles/file/39343106888.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/06caaf979560c4721da635338d62a5ff/tubuvibizimavodo.pdf
    • http://www.agenbenangbandung.net/file/jatosigobeled.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608663eab78f0---80120060712.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/304ebd91a1343adfa07a465d0d392c44/31923353694.pdf
    • http://scbczy.cn/up_files/file/20210616_023405.pdf
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/jexelegim.pdf
    • https://groupunsur4.com/contents//files/7175569110.pdf
    • http://arlingtonhigh1959.com/clients/863184/File/14691498544.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160809cc8e48de---81185479640.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/1b7ff6f228c5a8d9e9a6de11acbacea1/19400999884.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/xibokariduxekolijev.pdf
    • https://jobtiara.com/files/files/sarubiledarajaserabeme.pdf
    • https://bhsbeacon.com/FCKeditor/file/39813861735.pdf
    • http://pospatrans.cz/UserFiles/File/diwumivigopo.pdf
    • https://olterus.net/contents//files/73471687867.pdf
    • http://designklasse.de/ckfinder/userfiles/files/logategazibow.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084463b535b6---wawolewuzulipedavof.pdf
    • http://web68s.com/upload/files/gomogexolexexuzenag.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+plot+an+equation+on+excel
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B9 16792 bytes
font_01_sfnt_off0000fcd0.bin
7e1557cc4546e72ffc01739497d8b00f039f62cd098c48706b224b63c16a4b86
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD0 10524 bytes
font_02_sfnt_off000114ea.bin
cf9392ec5fbf2e9ce670a5e4eca05937f7d14306ae4bfd4c339fba0275cb2419
pdf-font-stream PDF embedded font (sfnt) at offset 0x114EA 17704 bytes